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IEEE 1427-2006

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

IEEE Guide for Recommended Electrical Clearances and Insulation Levels in Air Insulated Electrical Power Substations
Available format(s)

PDF

Superseded date

04-26-2021

Language(s)

English

Published date

05-04-2007

Publisher

Institute of Electrical & Electronics Engineers

1 Overview
  1.1 Scope
  1.2 Purpose
2 Normative references
3 Definitions
4 Criteria
  4.1 Safety codes and regulations
  4.2 Basic lightning impulse insulation level criteria
  4.3 Radio interference voltage and corona criteria
  4.4 Operating history
  4.5 Economic aspects
  4.6 Community acceptance
5 Substation insulation coordination
  5.1 Protective margins and arrester maximum continuous
      operating voltage
  5.2 Selection of basic lightning impulse insulation level
      and basic switch impulse insulation level
  5.3 Selection of electrical clearances
6 Electrical operating/design clearances
  6.1 General discussions
  6.2 Historical background
  6.3 Clearances based on lightning impulse conditions
  6.4 Clearances based on switching surge conditions
7 Electric maintenance/safety clearances
8 Substation voltage uprating and compact design
  8.1 BIL/System voltage ratio concept
  8.2 Other considerations
Annex A (informative) Bibliography
Annex B (informative) Example calculations

This guide, covering three-phase ac systems from 1 kV to 800 kV, provides recommended electrical operating and safety clearances and insulation levels in air-insulated electric supply substations; addresses insulation coordination procedures; provides design procedures for the selection and coordination of the insulation levels within the station as they relate to substation clearances; and addresses how reduced clearances in high-voltage ac substations will allow for compact bus arrangements and substation voltage uprating applications.

Committee
Substations
DevelopmentNote
Supersedes IEEE DRAFT 1427. (10/2007)
DocumentType
Standard
ISBN
978-0-7381-5311-7
Pages
50
PublisherName
Institute of Electrical & Electronics Engineers
Status
Superseded
SupersededBy
Supersedes

IEEE 1268-2005 IEEE Guide for Safety in the Installation of Mobile Substation Equipment
IEEE C2-2023 REDLINE 2023 National Electrical Safety Code(R) (NESC(R))
IEEE 1268-2016 REDLINE IEEE Guide for Safety in the Installation of Mobile Substation Equipment
IEEE 1264-2015 IEEE Guide for Animal Deterrents for Electric Power Supply Substations

IEEE 1127-2013 REDLINE IEEE Guide for the Design, Construction, and Operation of Electric Power Substations for Community Acceptance and Environmental Compatibility
IEEE 1313.1-1996 IEEE Standard for Insulation Coordination - Definitions, Principles and Rules
IEEE C2-2002 National Electrical Safety Code 2002 Edition
IEEE 998-2012 IEEE Guide for Direct Lightning Stroke Shielding of Substations
IEEE 4-2013 IEEE Standard for High-Voltage Testing Techniques
ANSI C84.1 : 2016 ELECTRIC POWER SYSTEMS AND EQUIPMENT - VOLTAGE RATINGS (60 HERTZ)
IEEE 1313.2-1999 IEEE Guide for the Application of Insulation Coordination
IEEE 1264-2015 IEEE Guide for Animal Deterrents for Electric Power Supply Substations

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